I just finished Daredevil season 2 (great show for oppers) and for those who don't know Daredevil is a blind guy that has super senses so he can "see" with sound. So I looked around online for real life human echo locators and there are blind people that have a functioning echo location skills. Tests were done and they have normal hearing as any sighted person. As an opper improving our sense of hearing to that level would be extremely useful. I am in the process of looking for more studies on it and wanted to float the idea out there.